But after allegations that Cambridge Analytica misused the data of millions of Facebook users, those who use the social media site are wondering about their privacy. Facebook upped its estimate of affected users Wednesday to 87 million from 50 million.

(Jaap Arriens/TNS)

Scrutiny of Facebook has increased with the Federal Trade Commission announcing last week that it is investigating the company's privacy practices and whether it violated a consent order to disclose how customers' data is used. Facebook said that was a violation of its terms of service.

Facebook said Cambridge Analytica got the data through a University of Cambridge psychology lecturer who developed a personality prediction app called "thisisyourdigitallife."

The Associated Press reported that Facebook didn't tell the 50 million users affected by Cambridge that their data had been used in ways without their permission, and failed to verify that Cambridge destroyed that information.